Shiki Ryogi
A teenage girl, who possesses the "Mystic Eyes of Death Perception", a supernatural ability that allows the user to see the inherent mortality of everything (both living and non-living). She recently recovered from a two-year coma caused by a traffic accident. Prior to the traffic accident, she originally had two personalities, a male and female personality.
Mikiya Kokuto
Shiki's friend who, two years ago, made a promise with Shiki to attend college. With his hopes of attending college with Shiki crushed because of her coma, he drops out of college to work under Touko as an assistant investigator. Touko holds his investigative skills with high-regard because of his ability to find her workplace, an abandoned building hidden to all except those who wish to find it.